﻿352 
  

  

  H. 
  G. 
  SEELEZ 
  ON 
  XEUSIICOSATJRTTS 
  PTTSILLT7S. 
  

  

  jaw, 
  still 
  containing 
  threo 
  teeth, 
  two 
  in 
  one 
  ramus 
  and 
  one 
  in 
  the 
  other. 
  

   These 
  teeth 
  are 
  directed 
  outward 
  and 
  upward 
  ; 
  they 
  are 
  white, 
  with 
  

   a 
  cylindrical 
  fang, 
  and 
  a 
  slightly 
  expanded 
  crown 
  ; 
  but 
  the 
  fragment 
  

   of 
  lower 
  jaw 
  is 
  very 
  small 
  and 
  slender; 
  it 
  obscures 
  the 
  anterior 
  

   termination 
  of 
  the 
  snout 
  so 
  that 
  the 
  premaxillary 
  bones 
  are 
  not 
  

   seen. 
  The 
  maxillary 
  bones 
  extend 
  backward 
  to 
  tho 
  region 
  of 
  the 
  

   orbits, 
  and 
  appear 
  to 
  have 
  been 
  about 
  18 
  mm. 
  long. 
  The 
  sockets 
  

   for 
  the 
  teeth 
  are 
  circular, 
  and 
  about 
  half 
  a 
  dozen 
  can 
  be 
  counted 
  on 
  

   the 
  left 
  side 
  of 
  the 
  specimen. 
  The 
  alveolar 
  border 
  is 
  elevated 
  on 
  

   the 
  inner 
  margin 
  of 
  the 
  sockets. 
  The 
  palatal 
  plates 
  of 
  the 
  max- 
  

   illary 
  bones 
  are 
  moderately 
  developed 
  in 
  front 
  of 
  the 
  palatal 
  nares 
  ; 
  

   they 
  do 
  not 
  meet 
  in 
  the 
  median 
  line, 
  but 
  rest 
  upon 
  a 
  vomer, 
  which 
  

   is 
  either 
  double 
  or 
  grooved 
  in 
  the 
  middle. 
  The 
  palatal 
  nares 
  appear 
  

   to 
  have 
  been 
  ovate, 
  but 
  the 
  posterior 
  border 
  is 
  not 
  clear; 
  they 
  

   approach 
  to 
  within 
  6 
  mm. 
  of 
  the 
  anterior 
  extremity 
  of 
  the 
  head 
  as 
  

   preserved 
  with 
  the 
  lower 
  jaw. 
  Posterior 
  to 
  the 
  nares, 
  the 
  palate 
  is 
  

   deeply 
  concave 
  from 
  side 
  to 
  side. 
  This 
  concavity 
  is 
  due, 
  in 
  part, 
  to 
  

   the 
  mode 
  of 
  development 
  of 
  the 
  palatine 
  bones, 
  though 
  their 
  limits 
  

   are 
  not 
  clearly 
  defined. 
  They 
  appear 
  to 
  be 
  narrow 
  in 
  front, 
  and 
  to 
  

   widen 
  in 
  a 
  V-shape 
  behind, 
  and 
  to 
  have 
  the 
  posterior 
  border 
  concave. 
  

   I 
  am 
  unable 
  to 
  recognize 
  with 
  certainty 
  any 
  suture 
  between 
  them. 
  

   The 
  posterior 
  processes 
  diverge 
  towards 
  the 
  thickened 
  part 
  of 
  the 
  

   maxillary 
  bone, 
  where 
  the 
  teeth 
  appear 
  to 
  terminate. 
  There 
  is 
  a 
  

   median 
  ridge 
  on 
  the 
  palatine, 
  which 
  dies 
  away 
  posteriorly 
  ; 
  thus 
  the 
  

   palatines 
  appear 
  to 
  form 
  the 
  posterior 
  roof 
  of 
  the 
  nares. 
  They 
  

   terminate 
  backward 
  in 
  a 
  sharp 
  ridge. 
  Posterior 
  to 
  this 
  ridge, 
  

   which 
  is 
  13 
  mm. 
  from 
  the 
  snout, 
  the 
  palate 
  becomes 
  concave 
  from 
  

   front 
  to 
  back, 
  and 
  appears 
  to 
  include 
  two 
  pairs 
  of 
  vacuities. 
  The 
  

   smaller 
  pair 
  is 
  in 
  about 
  the 
  middle 
  of 
  the 
  skull, 
  and 
  probably 
  just 
  

   below 
  the 
  orbits, 
  which 
  are 
  not 
  seen. 
  The 
  two 
  pairs 
  of 
  vacuities 
  

   appear 
  to 
  be 
  separated 
  from 
  each 
  other 
  by 
  the 
  transverse 
  bone, 
  

   which 
  is 
  only 
  preserved 
  on 
  the 
  left 
  side, 
  and 
  unites 
  with 
  the 
  hinder 
  

   margin 
  of 
  tho 
  maxillary 
  and 
  with 
  the 
  pterygoid 
  bones. 
  The 
  ptery- 
  

   goids 
  divide 
  the 
  anterior 
  pair 
  of 
  these 
  vacuities 
  from 
  each 
  other 
  ; 
  

   they 
  appear 
  to 
  show 
  a 
  median 
  suture, 
  are 
  much 
  constricted 
  from 
  

   side 
  to 
  side, 
  but 
  diverge 
  posteriorly 
  ; 
  they 
  are 
  short, 
  and 
  it 
  is 
  not 
  

   possible 
  to 
  speak 
  with 
  certainty 
  of 
  their 
  posterior 
  limit, 
  since 
  no 
  

   sutures 
  can 
  be 
  accurately 
  defined, 
  and 
  the 
  large 
  mass 
  of 
  bone 
  

   between 
  the 
  hindermost 
  pair 
  of 
  palatal 
  vacuities 
  has 
  all 
  the 
  charac- 
  

   ters 
  of 
  the 
  basisphenoid. 
  This 
  region 
  is 
  broadly 
  channelled 
  in 
  

   length, 
  its 
  lateral 
  margins 
  are 
  concave 
  ; 
  and 
  posterior 
  to 
  it 
  is 
  the 
  

   basioccipital. 
  It 
  gives 
  attachment 
  to 
  the 
  quadrate 
  bones 
  pos- 
  

   teriorly, 
  which 
  evidently 
  send 
  processes 
  forward 
  and 
  inward 
  so 
  as 
  to 
  

   meet 
  backward 
  processes 
  of 
  the 
  pterygoid. 
  There 
  is 
  no 
  articular 
  

   condyle 
  to 
  the 
  quadrate 
  bone 
  ; 
  but 
  the 
  articular 
  surface 
  appears 
  to 
  

   have 
  been 
  slightly 
  concave. 
  The 
  palatal 
  space 
  between 
  the 
  condyles 
  

   is 
  concave 
  ; 
  but 
  the 
  condyles 
  themselves 
  do 
  not 
  seem 
  to 
  have 
  been 
  

   prominently 
  developed. 
  The 
  malar 
  bar 
  is 
  preserved 
  on 
  the 
  right 
  

   side 
  of 
  the 
  specimen 
  only 
  ; 
  but 
  its 
  condition 
  does 
  not 
  show 
  sutures, 
  

   and 
  therefore 
  gives 
  no 
  evidence 
  of 
  the 
  quadrato-jugal. 
  The 
  occipi- 
  

  

  